Patents by Inventor Kwanho Chang
Kwanho Chang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240409796Abstract: A silicone adhesive is shown and described herein. The silicone adhesive composition comprises a silicone resin, a silicone fluid, and an aminosilane. The aminosilane contains two or more amino groups, where the amino groups can be bound to a single silicon atom or may be bound to separate silicon atoms in a silicon core unit. The silicone adhesive compositions are suitable for use as hot melt adhesives and can be used to coat or otherwise encapsulate an article.Type: ApplicationFiled: June 6, 2023Publication date: December 12, 2024Inventors: Kwanho Chang, Yeonseok Cho, Tiberiu Siclovan, David Newsham
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Patent number: 12049576Abstract: A process for producing a silicone pressure sensitive adhesive is shown and described herein. The process comprises reacting a MQ silicone resin with a polydiorganosiloxane in the absence of a solvent. The MQ silicone resin is a solid, solventless MQ resin. The reaction may be conducted in the presence of a catalyst, a chain extension reagent, or a combination thereof, and the resulting pressure sensitive adhesive can be dissolved in a solvent and the solids content adjusted. The present method provides a manner to provide a cleaner adhesive material that is free of unwanted materials such as aromatic solvents and also substantially free of cyclic siloxane impurities.Type: GrantFiled: April 5, 2021Date of Patent: July 30, 2024Assignee: Momentive Performance Materials Inc.Inventors: Arindam Sannigrahi, Sandeep Naik, Meenal Mehra, Debarshi Dasgupta, Tiberiu Mircea Siclovan, Kwanho Chang
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Publication number: 20220325154Abstract: A process for producing a silicone pressure sensitive adhesive is shown and described herein. The process comprises reacting a MQ silicone resin with a polydiorganosiloxane in the absence of a solvent. The MQ silicone resin is a solid, solventless MQ resin. The reaction may be conducted in the presence of a catalyst, a chain extension reagent, or a combination thereof, and the resulting pressure sensitive adhesive can be dissolved in a solvent and the solids content adjusted. The present method provides a manner to provide a cleaner adhesive material that is free of unwanted materials such as aromatic solvents and also substantially free of cyclic siloxane impurities.Type: ApplicationFiled: April 5, 2021Publication date: October 13, 2022Inventors: Arindam Sannigrahi, Sandeep Naik, Meenal Mehra, Debarshi Dasgupta, Tiberiu Mircea Siclovan, Kwanho Chang
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Publication number: 20170369635Abstract: Rapidly gelling epoxy resin systems include an epoxy resin, certain acrylate-functional compounds, and a curing agent mixture that includes a thiol curing agent and an amine curing agent. Gel times well less than 1 minute can be obtained. The ratio of acrylate-functional compound to thiol curing agent can be varied to adjust the gel time to precise values within a broad range.Type: ApplicationFiled: December 5, 2015Publication date: December 28, 2017Applicant: Dow Global Technologies LLCInventors: Adam C. Colson, Avery L. Watkins, Zubin B. Kuvadia, Kwanho Chang
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Patent number: 9771450Abstract: An epoxy composition that includes an epoxy-terminated prepolymer, an alkanolamine hardener having at least one hydroxyl group and an organometallic compound, where amine groups of the alkanolamine hardener react with epoxy groups of the epoxy-terminated prepolymer in a stoichiometric ratio to form a cured epoxy composition. The epoxy-terminated prepolymer is formed from a reaction product of an amine terminated polymeric polyol and a molar excess of epoxy groups in an epoxy monomer, relative to a molar amount of amine groups in the amine terminated polymeric polyol.Type: GrantFiled: December 13, 2013Date of Patent: September 26, 2017Assignee: Dow Global Technologies LLCInventors: Kwanho Chang, Jia Xie, Shouren Ge, Nathan Wilmot, Rajat Duggal
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Patent number: 9688875Abstract: The present invention relates to epoxy coating formulations that comprise an epoxy functional component comprising at least one epoxy functional ingredient comprising an average of at least 1.Type: GrantFiled: December 28, 2012Date of Patent: June 27, 2017Assignee: DOW GLOBAL TECHNOLOGIES LLCInventor: Kwanho Chang
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Patent number: 9518147Abstract: An amine endcapped adduct composition including an amine endcapped adduct formed from a monofunctional epoxide and a polyether amine. The monofunctional epoxide and the polyether amine are combined in a molar ratio of 1.0:2.0 to 1.0:8.0 moles of epoxide functionalities to moles of polyether amine functionalities.Type: GrantFiled: September 24, 2013Date of Patent: December 13, 2016Assignee: Dow Global Technologies LLCInventors: Angela I. Padilla-Acevedo, Nathan Wilmot, Rajat Duggal, Harshad M. Shah, Kwanho Chang
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Publication number: 20160181027Abstract: A process for producing a circuit-breaker pole part for use in a medium-voltage or high-voltage circuit-breaker comprising adjoining (a) an inner vacuum interrupter layer, (b) an intermediate compensation layer, and (c) an outer insulating sleeve layer, wherein the intermediate compensation layer is disposed between the inner vacuum interrupter layer and the outer insulating sleeve layer; wherein said layers are integrated with each other to form a circuit-breaker pole part; and wherein the intermediate compensation layer comprises the reaction product of (I) an epoxy-terminated prepolymer and (II) a curing agent; and a circuit-breaker pole part produced by the above process.Type: ApplicationFiled: August 22, 2013Publication date: June 23, 2016Inventors: Yewen Cao, Huan Chen, Kwanho Chang
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Patent number: 9371416Abstract: An epoxy terminated prepolymer formed as a reaction product of a cycloaliphatic epoxide resin and an amine terminated polymeric polyol, and a catalyst that promotes the reaction of the cycloaliphatic epoxide resin and the aminated polyol. The epoxy terminated prepolymer and an anhydride hardener react to form an epoxy elastomer composition having a microphase separated morphology of hard particles, formed with the anhydride hardener reacted with the epoxy terminated prepolymer, dispersed in a soft continuous phase formed from polymeric polyol in the epoxy terminated prepolymer.Type: GrantFiled: December 20, 2012Date of Patent: June 21, 2016Assignee: Dow Global Technologies LLCInventors: Kwanho Chang, Harshad M Shah, Rajat Duggal
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Publication number: 20160168416Abstract: A flooring coating composition includes a coating agent that is a reaction product of an epoxy based formulation, the epoxy based formulation being at least one of an epoxy prepolymer formulation, an epoxy-silane hybrid formulation, and an epoxy thiol acrylate formulation. The coating agent in a cured state exhibits a first tan delta peak between a first temperature range of 75 C to 0 C and a second tan delta peak between a second temperature range of 20 C and 75 C, according to a tan delta plot over a range of temperatures. A value of the first tan delta peak and a value of the second tan delta peak each represents a ratio of a loss modulus of the coating agent and a storage modulus of the coating agent at a specific temperature within the range of temperatures, as measured according to dynamic mechanical thermal analysis. The values of the first and the second tan delta peaks are from 0.10 to 0.80.Type: ApplicationFiled: September 4, 2014Publication date: June 16, 2016Inventors: Venkat S Minnikanti, Marcus Pfarherr, Eva-Maria Michalski, Kamesh R. Vyakaranam, William H. Heath, Kwanho Chang, Rajesh H. Turakhia, Larissa Falsarella, Adam C. Colson
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Publication number: 20150307651Abstract: An epoxy composition that includes an epoxy-terminated prepolymer, an alkanolamine hardener having at least one hydroxyl group and an organometallic compound, where amine groups of the alkanolamine hardener react with epoxy groups of the epoxy-terminated prepolymer in a stoichiometric ratio to form a cured epoxy composition. The epoxy-terminated prepolymer is formed from a reaction product of an amine terminated polymeric polyol and a molar excess of epoxy groups in an epoxy monomer, relative to a molar amount of amine groups in the amine terminated polymeric polyol.Type: ApplicationFiled: December 13, 2013Publication date: October 29, 2015Applicant: Dow Global Technologies LLCInventors: Kwanho Chang, Jia Xie, Shouren Ge, Nathan Wilmot, Rajat Duggal
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Publication number: 20150259466Abstract: An amine endcapped adduct composition including an amine endcapped adduct formed from a monofunctional epoxide and a polyether amine. The monofunctional epoxide and the polyether amine are combined in a molar ratio of 1.0:2.0 to 1.0:8.0 moles of epoxide functionalities to moles of polyether amine functionalities.Type: ApplicationFiled: September 24, 2013Publication date: September 17, 2015Applicant: Dow Global Technologies LLCInventors: Angela I. Padilla-Acevedo, Nathan Wilmot, Rajat Duggal, Harshad M. Shah, Kwanho Chang
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Publication number: 20150232386Abstract: Polymer concrete compositions comprising a silane-modified polymer (SMP) composition which comprises a silylated polymer, an epoxy resin, e.g., an epoxy-terminated prepolymer, and a cure catalyst, e.g., tetraethyltetraamine, exhibit good adhesion to wet concrete.Type: ApplicationFiled: August 12, 2013Publication date: August 20, 2015Inventors: Kamesh Vyakaranam, Dwight Latham, Kwanho Chang
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Publication number: 20140357813Abstract: An epoxy terminated prepolymer formed as a reaction product of a cycloaliphatic epoxide resin and an amine terminated polymeric polyol, and a catalyst that promotes the reaction of the cycloaliphatic epoxide resin and the aminated polyol. The epoxy terminated prepolymer and an anhydride hardener react to form an epoxy elastomer composition having a microphase separated morphology of hard particles, formed with the anhydride hardener reacted with the epoxy terminated prepolymer, dispersed in a soft continuous phase formed from polymeric polyol in the epoxy terminated prepolymer.Type: ApplicationFiled: December 20, 2012Publication date: December 4, 2014Applicant: Dow Global Technologies LLCInventors: Kwanho Chang, Harshad M. Shah, Rajat Duggal
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Publication number: 20140349049Abstract: The present invention relates to epoxy coating formulations that comprise an epoxy functional component comprising at least one epoxy functional ingredient comprising an average of at least 1.Type: ApplicationFiled: December 28, 2012Publication date: November 27, 2014Applicant: DOW Global Technologies LLCInventor: Kwanho Chang
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Patent number: 7888418Abstract: Embodiments of a polymer and vegetable oil based composition comprise a polylactide homopolymer, a vegetable oil dispersed inside the polylactide homopolymer, and a block copolymer configured to aid the dispersion of the vegetable oil inside the polylactide homopolymer.Type: GrantFiled: December 17, 2007Date of Patent: February 15, 2011Assignees: Toyota Motor Engineering & Manufacturing North America, Inc., University of MinnesotaInventors: Eric John Connell, Marc Andrew Hillmyer, Kwanho Chang
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Publication number: 20090156746Abstract: Embodiments of a polymer and vegetable oil based composition comprise a polylactide homopolymer, a vegetable oil dispersed inside the polylactide homopolymer, and a block copolymer configured to aid the dispersion of the vegetable oil inside the polylactide homopolymer.Type: ApplicationFiled: December 17, 2007Publication date: June 18, 2009Inventors: Eric John Connell, Marc Andrew Hillmyer, Kwanho Chang